Sewing-machine



2 SheetsSheet 1. f

I} r fig Model.) -W. D. RUNDLETT.

SEWING MACHINE.

No. 570,962.! Patented Nov. 10, 1896.

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I (No Model.) I p Y 2 shets sheef 2. W. D. RUNDLETT. r SEWING MAGHINE. H I Elm-570,962. v v PatentedNov 10,1896.

UNITED STATES PATENT OFFICE.

WILLIAM D. RUNDLETT, OF NORTH ANDOVER, MASSACHUSETTS.

SEWINGQMACHINE.

SPECIFICATION forming part of Letters Patent No. 570,962, dated November 10, 1896.

Application filed August 2 1 1 3 9 To all whom, it mum cancer/z.- Be it known that I, WILLIAM D. RUNDLETT, ormerly of the city and county of Providence, 1n the State of Rhode Island, but now resid- =iig at North Andover, in the county of Essex and State of Massachusetts, have invented eertain new and useful Improvements in Waxlhread Sewing Machines; and I do hereby declare the following specification, taken in connection wit-h the accompanying drawings, forming a part of the same, to be afull, clear, and exact description thereof.

The present application is intended to take he place, and is a continuation, of applicalon Serial No. 437,877, filed June 24, 1892, and the renewal thereof, Serial No. 537,304, I iled February 4, 1895, which latter applica- I ion is to be abandoned.

' This invention relates to wax-thread sewing-machines such as are employed for sewing leather. As is well kn own, it is necessary in machines of this character in which a hookneedle is employed to form a loop of thread upon that side of the work which is opposite the side from which the needle operates, which said loop of thread is subsequently engaged by the hook of the needle and pulled into the work. The purpose of forming this loop of thread is to prevent rendering of the thread through the hook of the needle while in the work. It is desirable in the formation of this loop that there should'be as little rendering as possible of the thread through or over any of the loop-forming devices.

, In another application, filed June 24, 1892, Serial No. 437, 87 6, I have shown and described a sewing-machine for uniting the soles of boots and shoes to their uppers which embodies anovel organization and combination of loopforming devices, whereby the injurious effects of the thread renderingthrough or over the loop-forming devices are materially reduced. In the arrangement there shown, however, there is a rendering of the thread not only through the thread-eye, but also over the thread-arm.

The object of the present invention is to still further reduce the injurious effects of the thread rendering through or over the loopforming devices during the formation of the loop; and to that end. the invention consists Serial No. 560,872. (No model.)

in the combinations and arrangements of parts hereinafter described, whereby all rendering of thread over the thread-arm during the formation of the loop is entirely avoided.

For the purpose of illustrating the present 1 invention I have shown the same in the. ac-

companying drawings as applied to a sewingapplied thereto, as will be necessary to illus- I trate the construction and operation of such loop-forming devices.

Referring to the drawings, Figure l is an end elevation of a portion of a sole-sewing machine with my. invention applied thereto, a part of the frame being broken away to show the construction and arrangement of the loopforming devices. Fig. 2 is a section on the line y y of Fig. 1; and Figs. 3 to 9, inclusive, are diagrammatic views showing the different positions of the loop-forming devices in forming the loop of thread. In the machine shown in the drawings the operating parts are embodied in a head which is adapted to be mounted upon and secured to a suitable column or support A. This head consists of a suitable framework B. The machine is provided with a driving-shaft O, journaled in suitable supports. To this drivingshaft are secured the necessary cam-disks for actuating the different parts of the machine. As the present invention does not relate inany way to the construction or arrangement of these cam-disks, but only to the construction and arrangement of parts or devices to be operated thereby, it has not been deemed necessary to show all of said cam-disks in the drawings, and only one of the same, to wit, the cam-disk D, is shown.

The machine shown in the drawings is to be provided with a shuttle mounted in the shuttle-race 1, which is secured to the framework 13. Secured to this shuttle-race 1 is the fixed work-support 2, against which the work 3 is to be clamped by a presser-foot. (Not shown in the drawings.) v

4 represents a curved hook-needle which may be operated in any well-known manner.

The loop-formin g devices consistof a threadeye 5 and athread-arm 6, to the latter of which certain novel and peculiar movements are given to draw out the loop of thread. The

thread-eye 5 is arranged between the work eye 5 is secured to the end of the bar 8, which is capable of sliding vertically in suitable bearings attached to the frame of the machine. For giving tozthe thread-eye the necessary oscillating movement the bar 8 is provided with a crank 9,;the hub of which crank surrounds the bar Sand is provided .withza feather which enters a-longitudinal groove in the bar 8, whereby said bar may be turned upon its axis by said. crank 9, but willbe free to slide vertically in the hub thereof. To the crank 9 is pivoted a connecting-rod 10, the opposite end of which connecting-rod is pivoted to the end of the lever 11, which said lever is pivotedat 12. tola. bracket securedtto the frame. Said lever 11 is provided with a roller 13, which rides'in-arsuitable cam-groove in one of the cam-disks secured to the drivingshaft 0. Bythemechanisin above described thethreadseye 5 will be given the proper oscillating movements required.

Surroundingtheupper end of the bar 8 is a sleeve 114,,arranged between-a shoulder on said bar and a nut upon the endof the bar, as shown in .Fig. 2. The sleeve 14 is connected to-the free end of the lever 15 by means of the connecting-link 10.

at its-other end witha roller 18, adapted to ride in a suitable cam-groove in .one of the cam-disks secured to the driving-shaft O. Bythe mechanism above described the. threadeye is given an intermittent vertical moveend ofaconnecting-link 22, the-other endof which link is connected to one endof a bellcrank lever 23, pivoted to-the framework at 24. Theotherendof the bell-crank lever 23 carries a roll 25, which is adapted to ridein a suitable cam-groove in one of the cam-disks secured to the driving-shaft O. The threadarm 6 is provided with a tail or extension which isvpivoted at 26 to one end of a con The lever 15 is pivoted to the frame at 17 and is provided.

may be laid into the barb of the needle.

necting-link 27, the other end of which link is pivoted to the end of abe1l-cranklever28, which is pivoted to the frame at 29. The other end of the bell-crank lever 28 is provided with a roll 30, which is adapted to ride in a cam-groove in one. of the cam-disks secured to the driving-shaft G.

The operation of the loop-forming devices above described in forming a loop of thread is as follows, reference being had to the diagrammatic views, Figs. 3 to 9, inclusive: The parts being in the position shown in Figs. 1 and 4, being the position of the parts at the completion'of the last preceding stitch, the several cam-grooves in the cam-disks secured to the driving-shaft are so constructed and timed that the thread-eye will stand still in the-elevated position shown in Figs. 3-and' 4, while the thread-arm is moved from left to right, Fig. 4, underthe action of the lever 20,

link 22, bell-crank l'ever 23,.and its actuating cam-groove. At this timethere is no movement given to the bell-crank lever 28, and consequently the tail of the-thread-arm will be held by the connecting link 27,-thereby causingthethread-armto' turn upon its pivot 1'9,and so that asthethread-arm is drawnback by the link 22 the pivot'26 Will be caused to describe the arc of a circle and will travel from-a to-b, .Fig. 4. The result of this compound movement given .to the thread-arm G indrawing'back the loop will be to cause the hookof said thread-arm to describethe arc of a circle and to travel-from. a tob, Fig. 4, and; it willbe seenithat the arcwhi'ch the hook of thethread-armso-travels isdescribed not from the pivot 21,.but insteadzfromthe point of junction of the thread with the work-viz. from thepointoc'as a. center. By this movement of the threacharm the loop of thread willbe drawn out,as shown in Fig. 0.

WJhen-the threadrarnihas'reached the position shown in Fig.2 6, it is caused to remain at rest inthat position, while the thread-eye 5 is, by means of the connecting-link 16,.the

eye is moved from-the position-shown in full linesto theposition indicatedindotted. lines, Fig. 5, thus bringing the'thread into a position at the right of the needle and so that it During this time the needle has beenmoved up throughthework, andby the time thethreadeye has reached. its lowermost position the needle has reached its highest position, as shown in Fig. 8. The thread-eye is then 05- cillated in the opposite direction and so as to lay the thread into the barb of the needle, as shown in Figs. 7 and 8. The needle then begins to descend, and at the same time the 5 thread-arm is moved forward to enable the loop which has been formed to be drawn down through the work by the needle, the threadarm thus following np'and delivering'said loop as it is being drawn down until the loop frees itself from the hook of the thread arm, as shown in Fig. 9. Simultaneously with the commencement of the forward movement of the thread-arm.to deliver the loop to the needle the lever 28 is operated by its cam-groove to gradually lift. the link 27 and the tail of the thread-arm 6, and so that as the threadarm is moved forward by the link 22 the pivot 26 will be-moved through the path I) c, Fig. 4., and into the position shown in full lines in Fig. .9. By the combined action of the levers 23 and 28 and their connectinglinks the hook of the thread-arm during the forward movement of said arm is caused to travel in the arc of a circle from b to c, Fig. 4., and into the position shown in full lines in Fig. 9. Just before the forward movement of the thread-arm in delivering. the loop to the needle is completed the thread-eye is, by the proper mechanism, raised to the position shown in Fig. 9. After the loop has been drawn off from the hook of the threadarm, and after the thread-eye has been raised to its elevated position, the thread-arm is returnedtoits original position to rengage the thread for the formation of the next loop. This last movement of the thread-arm is effected solely by the lever 28 and the link 27, the lever. 20 at this time remaining stationary, whereby the proper movement of the lever 28 and link 27 will serve to swing the thread-arm on the pivot 19 and cause the hook of the thread-arm to travel in the are of a circle from c to a, Fig. 4, or from the po- 5 sition from which its oscillating movement began, but instead is moved only a portion of the entire distance, and so that when the thread-eye is raised to its elevated position it will stand in the position indicated in dotted lines in Fig. 3, in which position, as shown in dottedlines in said figure, the thread will be held to one side of the path of movement of the hook of thethread-arm, and so that the latter may pass without interference. Af-

i ter the thread-arm has reached the position shown in Fig. 4 the thread-eye is oscillated the remainder of the required distance to return said thread-eye to its original position, that is, is moved from the position shown in dotted lines to the position shown in fulllines, Fig. 3, thereby bringing the thread into the path of movement of the hook of the threadarm, and so that it will be engaged thereby upon the next rearward movement of said thread-arm. After the loop has been formed by the loop-formin g devices, and the thread is laid into the barb of the needle by the oscillation of the thread-eye, the needle begins to descend and draws the thread composing the loop. so formed down into and through the work in the usual manner, as shown in Fig. 9, the needle thus drawing out a loop upon the other side of the work to be engaged by the shuttle. The thread to form the loop so drawn through the work by the needle is furnished partly by the loop formedby the loopforming devices above described and partly but by reason of the Vertical movement given to said thread-eye and the fact that said thread-eye is caused to occupy an elevated position during the operation of the threadarm in drawing out the loop the angle at which thethread is drawn from the threadeye is greatly increased,whereby the tendency to abrade the thread as it renders through the thread-eye is materially reduced. The

subsequent downward movement given to the thread-eye is solely for the purpose of returning it to the proper vertical position to .lay the thread into the barb of the needle, and such downward movement does not-cause any substantial addition to the loop drawn out by the thread-arm, and with the result that there is practically no rendering of thread through the thread-eye during said downward movement.

As already pointed out, the hook of the thread-arm in moving backward to draw out the loop is caused by the mechanism above described to move in the arc of a circle about the point so at the junction of the thread and the work as a center. The thread being anchored or held at the point a; it follows that the distance between said point a; and the hook of the thread-arm will not be changed during the backward movement of the threadarm in drawing out the loop, and consequently there will be no rendering of the thread over the thread-arm during the formation of said loop.

By the peculiar method of operating the thread-arm above described all rendering of thread over the thread-arm in the formation of the loop is avoided, and by raising the thread-eye to an elevated position the injurious effects ofthe thread rendering through the thread-eye during the operation of the thread-arm are materially reduced, and by the combination of the thread-eye and threadarm, operated as described, the rendering of thread during the formation of the loop and the injurious effects thereof are reduced to a minimum.

hat I claim as my invention, and desire to secure by Letters Patent, is-

1. In a sewing-machine the combination with a hook-needle and a thread-eye, of a thread-arm, and mechanism for moving the hookof said thread-arm in the arc of a circle described from the point of junction between the thread and the Work as a center, substantially as described.

2. In a seWingmachine the combination with a h0ok-needle and thread-eye, of a thread-arm, and mechanism for moving the hook of said thread-arm in a triangular path, substantially as described.

3. In a sewing-machine the combination with a hook-needle and a thread-eye, of a thread arm, two levers for operating said arm, one of said levers being pivoted to said arm'intermediate of its ends, and the other of said levers being connected to one end of said thread-arm, and means for operating said levers, whereby a compound movement Will be given to the hook of said thread-arm,

substantially as described.

4. In a sewing-machine the combination of a hook-needle and a thread-arm, mechanism for moving the hook of said thread-arm in the are of a circle described from the point of junction between the thread and the Work as- \Vitnesses:

KATE O. FR E, PAUL M. CHASE.

It is hereby certified that Letters Patent No. 570,962, granted November 10, 1896, upon the application of William D. Rundlett, of North Andover, Massachusetts, for an improvement in Sewing-Machines, were erroneously issued to said Rundlett as sole owner of the invention; whereas said Letters Patent should have been issued to William H. Haskell, of Pawtaclcet, Rhocle Island, said Haskell being assignee of the entire interest in said invention, as shown by the assignment of record in this Office; and

that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed, countersigned, and sealed this 29th day of December, A. D., 1896.

JNO. M. REYNOLDS, Assistant Secretary of the Interior.

[SEAL] Countersigned: 7

JOHN S. SEYMOUR,

Commissioner of Patents. 

